Modeling the potential habitats of dusky, commons and bottlenose dolphins in the Humboldt Current System off Peru: The influence of non-El Niño vs. El Niño 1997-98 conditions and potential prey availability

Abundance and distribution patterns of cetaceans and their overlap with vessel traffic in the Humboldt Current Ecosystem, Chile

“…1, 2, 3, Supplementary Table S10). This corresponds with the reported distribution of the species in Peruvian waters 20 . The better fitting obtained by using SSTLT rather than SST indicates dusky dolphins prefer consistently warmer waters associated to regular upwelling events in the north in opposition to the highly seasonal upwelling patterns of the southern portion.…”

“…For sperm whales bathymetric features and SST have been correlated with their presence 44 , therefore SST, DEPTH and SLO were used as predictors. For dusky and common dolphins SST and DEPTH have been correlated with their distribution in the adjacent Peruvian portion of the HCE 20 , therefore here we used the same predictors. In addition, for dusky dolphins we also used SLO given their observed sightings associated to the flat shallow waters of northern Chile.…”

Citizen science data of cetaceans in the Arabian/Persian Gulf: Occurrence and habitat preferences of the three most reported species

“…Therefore, another possibility is that our results might reflect a specialization in a higher energy food web by finless porpoises relative to the other dolphin species regularly occurring in the area, although the details regarding composition of this potential food web are not available to us now. Similar ecological niche segregations have been observed in other studies of sympatric dolphins (Giménez et al, 2018;Llapapasca et al, 2018;Weir et al, 2009), and is likely crucial for the successful coexistence of various dolphin species in relatively restricted high productivity regions. Although we do not have the data to confirm, or even test this hypothesis in our study area, we think our results constitute a good starting point to direct future local ecological studies of these vulnerable cetaceans, in a region where little other sources of information are currently available.…”

Northernmost record of dusky dolphin <i>Lagenorhynchus obscurus</i> in coastal waters off northern Peru (4°S)

“…These cold conditions are unique for an upwelling ecosystem due to its position closest to the equator i.e., tropical latitude (Chavez & Messié 2009). Such conditions may be suitable not only for dusky dolphin but for the Peruvian anchovy (Engraulis ringens) which seems to be its preferred prey (García-Godos et al 2007, Llapapasca et al 2018. Our argument that the sighting at Los Órganos is the northern most record of dusky dolphin is based also on the fact that there is no published information of this species further north off Ecuador neither in sightings, stranding or by-catch literature (e.g., Van Waerebeek et al 1997, Clarke et al 2002, Félix et al 2007.…”

“…Along the southeast Pacific coast of Peru, earlier Van Waerebeek (1992) proposed Chimbote (9°S) as the northern limit of the distribution of dusky dolphin. Multiple new records (Van Waerebeek et al 1997, Reyes 2009, Tzika et al 2010, Llapapasca et al 2018 indicated that Salaverry…”